There are many controversial books that have been challenged and/or banned. Reasons for banning books is if they contain sexual content, foul language, racism, religious beliefs, criticism, or other explicit material. The Lorax was banned because the book portrays the foresting industry in a negative way. There are many other children's books that have been banned for reasons that are so easy to miss when you read the books. One example of a banned Children's book is The Butter Battle book by Dr. Seuss. Some say this book has an anti-war message.